Micro Frontend vs SPA: Which Architecture Should You Choose?

Your SPA was perfect at 3 developers. At 8 developers, it's a war zone. Merge conflicts every morning. A broken Support page blocking the Cart team's release. 5-minute builds that used to take 20 seconds. And a 2.8 MB bundle that loads chart.js, leaflet, and xlsx on the homepage — where nobody needs them. Sound familiar? I just published a deep-dive comparing SPA and Micro Frontend architectures with 15 real code blocks showing both approaches side by side: What you'll see: → SPA webpack.config.js vs MFE webpack.config.js (Local AND Production — they're different) → SPA routing (all routes in one file) vs MFE routing (lazy-loaded remote apps) → SPA deployment (one build, one deploy, one bottleneck) vs MFE deployment (30-second independent builds) → SPA bundle problem (2.8 MB all upfront) vs MFE targeted loading (150-300 KB per MFE) → React Host (ModuleFederationPlugin) vs Next.js Host (NextFederationPlugin) — the config is NOT the same → Turborepo pipeline for parallel MFE builds → 4-s